Add support for preprocessing the entire sass/less/css source with Li…

…quid.

TODO.md

@@ -0,0 +1,3 @@
+# 2.1
+  - [x] Add support for processing text files with Liquid.
+  - [ ] Process tag arguments with Liquid, not just values.

jekyll-assets.gemspec

@@ -22,6 +22,7 @@ Gem::Specification.new do |spec|
   spec.add_runtime_dependency("sprockets-helpers", "~> 1.2")
   spec.add_runtime_dependency("fastimage", "~> 1.8")
   spec.add_runtime_dependency("jekyll", "~> 3.0")
+  spec.add_runtime_dependency("tilt", "~> 2.0")
 
   spec.add_development_dependency("nokogiri", "~> 1.6")
   spec.add_development_dependency("envygeeks-coveralls", "~> 1.0")

lib/jekyll/assets.rb

@@ -2,6 +2,7 @@
 # Copyright: 2012-2015 - MIT License
 # Encoding: utf-8
 
+require "tilt"
 require "sprockets"
 require "jekyll"
 

lib/jekyll/assets/addons.rb

@@ -5,6 +5,7 @@
 require_relative "addons/compass"
 require_relative "addons/bootstrap"
 require_relative "addons/autoprefixer"
+require_relative "addons/processors/liquid"
 require_relative "addons/proxies/magick"
 require_relative "addons/font_awesome"
 require_relative "addons/js_es6"

lib/jekyll/assets/addons/processors/liquid.rb

@@ -0,0 +1,36 @@
+module Jekyll
+  module Assets
+    module Addons
+      module Processors
+        class Liquid < Tilt::Template
+          ProcessingFor = %W(
+            text/css text/sass text/less text/scss
+            text/coffeescript text/javascript
+          )
+
+          def prepare
+            #
+          end
+
+          # Render the file with the sites current context, anything you
+          # can do in a normal liquid file with Jekyll, you can do here inc,
+          # accessing the entirety of your posts and pages, though I don't
+          # know why you would want to, and I ain't judging you.
+
+          def evaluate(scope, locals, jekyll = scope.environment.jekyll, &block)
+            jekyll.liquid_renderer.file(@file).parse(data).render!(
+              jekyll.site_payload, :registers => {
+                :site => jekyll
+              }
+            )
+          end
+        end
+      end
+    end
+  end
+end
+
+# There might be a few missing, if there is please do let me know.
+Jekyll::Assets::Addons::Processors::Liquid::ProcessingFor.each do |val|
+  Sprockets.register_preprocessor val, Jekyll::Assets::Addons::Processors::Liquid
+end

spec/fixture/_assets/css/liquid.scss

@@ -0,0 +1,3 @@
+.background {
+  background: url(asset_path("{{ site.background_image }}"))
+}

spec/fixture/_config.yml

@@ -0,0 +1 @@
+background_image: ruby.png

spec/lib/jekyll/assets/addons/processors/liquid_spec.rb

@@ -0,0 +1,16 @@
+# Frozen-string-literal: true
+# Copyright: 2012-2015 - MIT License
+# Encoding: utf-8
+
+require "rspec/helper"
+describe Jekyll::Assets::Addons::Processors::Liquid do
+  let(:env) do
+    Jekyll::Assets::Env.new(stub_jekyll_site)
+  end
+
+  it "lets the user use Liquid" do
+    source = env.find_asset("liquid").to_s
+    expect(source).not_to(match(/\{{2}\s*site\.background_image\s*\}{2}/))
+    expect(source).to(match(/background:\s*url\("\/assets\/ruby\.png"\)/))
+  end
+end